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User-reported unhelpful error message
Program: https://code.world/haskell#PiIMlFBWzEvxf9rdaJ2CELg
Message:
program.hs:(3,8)-(4,23): error:
Unexpected do block in function application:
do print (circleArea 12)
You could write it with parentheses
Or perhaps you meant to enable BlockArguments?